PC turn on for split and shutdown or random shutdown while use!!

[John9]

Hi Guyz...

So I built a gaming rig last Christmas and work fine for 2 months. Then one day tried turning it on and it just powered on for split second and shut off. So left it unplugged for few hours then it worked normal again for a few weeks, until it started to randomly shutdown like if there were a power outage(not overheating because it run for hours and sometimes it shut down 10 min when power on). After some digging around I decided to unplug all cables from fully modular PSU except the 24 pin cable and do the paperclip test. Found out that the PSU shut down around 10 mins with nothing connected.

So is the brand new clear paper sealed psu failed on me after a few months???

If u need more info let me know.

Pc Specs;

GPU: Gigabyte Arous GTX 1060 6gb

CPU: i7-8700k

Mobo: Gigabyte z370xp sli gaming

PSU: Seasonic focus plus 750w 80+ gold

Ram: 2x8gb ballistix ddr4 2666mhz

[PatXioPC]

Seems like the core point of failure is the PSU, but there might be these two ways it can happen:
1 your system drawing more power than the PSU itself is rated at or simply just delivers inconsistent power so your system won't post for long.   
2 Failure of internal components, where in that case, it should be covered by the warranty if it has already.  

[homeap5]

Even best PSU can fail. But... power suppliers have their own protections and "paperclip test" should be made with anything connected, otherwise is not so strange that it shut down itself.

 

I think it may be mainboard. Connect your PSU to ANY other computer and then test for real. PSU has own reasons to turn off if something is wrong. Bad motherboard or run 10 minutes with paperclip is good reason to shut down for protection.

 

I hope you answer later what is wrong (PSU or mobo) but personally I think that there are few types of products - very good, good, average, bad and Gigabyte. (sorry, it's just my personal opinion)

[vanished]

It is possible it's the PSU but despite that test, I'm not convinced yet.  If you have the option to try your PC on a different PSU, or to try that PSU on another PC, I would do it as it would shed light on the true cause.  My initial thought was it could be motherboard but at this point there just isn't much to go on.

[John9]

3 minutes ago, homeap5 said:

Even best PSU can fail. But... power suppliers have their own protections and "paperclip test" should be made with anything connected, otherwise is not so strange that it shut down itself.

 

I think it may be mainboard. Connect your PSU to ANY other computer and then test for real. PSU has own reasons to turn off if something is wrong. Bad motherboard or run 10 minutes with paperclip is good reason to shut down for protection.

At one time I connected only 2 case fan with paper clip test and it shut down in 5 mins then I tried it again with same case fan and it shut down in like 10 mins. 

When that happened, I unplugged PSU and stick a wire in the green and black wires and left it overnight to like drain PSU then pc worked normal for a week until it started it give problem again. So still unsure.?

[John9]

2 hours ago, Ryan_Vickers said:

It is possible it's the PSU but despite that test, I'm not convinced yet.  If you have the option to try your PC on a different PSU, or to try that PSU on another PC, I would do it as it would shed light on the true cause.  My initial thought was it could be motherboard but at this point there just isn't much to go on.

That's the next prob... Don't have/access to another PC to test with. Was thinking about buy a new PSU and see if problem solve... If not will send back psu. But before doing so, just wanted to get some thoughts on it.